X515C DF & X510C Manual - Lowrance
X515C DF & X510C Manual - Lowrance
X515C DF & X510C Manual - Lowrance
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Section 4: Sonar Options & Other<br />
Features<br />
ASP (Advanced Signal Processing)<br />
The ASP feature is a noise rejection system built into the sonar unit<br />
that constantly evaluates the effects of boat speed, water conditions<br />
and interference. This automatic feature gives you the best display possible<br />
under most conditions.<br />
The ASP feature is an effective tool in combating noise. In sonar terms,<br />
noise is any undesired signal. It is caused by electrical and mechanical<br />
sources such as bilge pumps, engine ignition systems and wiring, air<br />
bubbles passing over the face of the transducer, even vibration from the<br />
engine. In all cases, noise can produce unwanted marks on the display.<br />
The ASP feature has four settings — Off, Low, Medium and High. If<br />
you have high noise levels, try using the "High" ASP setting. However,<br />
if you are having trouble with noise, we suggest that you take steps to<br />
find the interference source and fix it, rather than continually using<br />
the unit with the high ASP setting.<br />
There are times when you may want to turn the ASP feature off. This<br />
allows you to view all incoming echoes before they are processed by the<br />
ASP feature.<br />
Sonar Menu with Sonar Features selected (left). Sonar<br />
Features menu (center) with Noise Rejection set to the default low setting.<br />
(Note the Transducer Frequency segment of the Sonar Features<br />
menu will not be present in the single frequency X-510c.)<br />
To change the ASP level<br />
1. From the Sonar Page, press MENU|↓ to SONAR FEATURES|ENT.<br />
2. Press ↓ to NOISE REJECTION|ENT.<br />
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